The deluxe room at HRH has a max occupancy of 5. It may fit 6 but you wont get a room key for the 6th and it wouldnt be allowed on the reservation.
The same deal at Portofino, max 5 to a room unless you take a 2 bedroom suite...big bucks. I would look into 2 rooms at RPR gardenview thats the least expensive way to go unless you put the 6 in a room minus the one key.